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Re: Insert performance, what should I expect?

From: Robert Creager <Robert_Creager(at)LogicalChaos(dot)org>
To: Rod Taylor <pg(at)rbt(dot)ca>
Cc: Brock Henry <brock(dot)henry(at)gmail(dot)com>,Postgresql Performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Insert performance, what should I expect?
Date: 2004-10-20 16:45:27
Message-ID: 20041020104527.14927c06@thunder.mshome.net (view raw or flat)
Thread:
Lists: pgsql-performance
When grilled further on (Tue, 19 Oct 2004 22:12:28 -0400),
Rod Taylor <pg(at)rbt(dot)ca> confessed:

> > I've done some manual benchmarking running my script 'time script.pl'
> > I realise my script uses some of the time, bench marking shows that
> > %50 of the time is spent in dbd:execute.
> > 
> 1) Drop DBD::Pg and switch to the Pg driver for Perl instead (non-DBI
> compliant) which has functions similar to putline() that allow COPY to
> be used.

COPY can be used with DBD::Pg, per a script I use:

$dbh->do( "COPY temp_obs_$band ( $col_list ) FROM stdin" );
$dbh->func( join ( "\t", @data ) . "\n", 'putline' );
$dbh->func( "\\.\n", 'putline' );
$dbh->func( 'endcopy' );

With sets of data from 1000 to 8000 records, my COPY performance is consistent
at ~10000 records per second.

Cheers,
Rob

-- 
 10:39:31 up 2 days, 16:25,  2 users,  load average: 2.15, 2.77, 3.06
Linux 2.6.5-02 #8 SMP Mon Jul 12 21:34:44 MDT 2004

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